for accurate location of targets by a survaillance radar it is required that the map of the area is loaded into the radar. how is it done?what are the various types of maps?how is map loaded in a ELM 2140 radar system?

for accurate location of targets by a survaillance radar it is required that the map of the area is loaded into the radar. how is it done?what are the various types of maps?how is map loaded in a ELM 2140 radar system?

Isn't this rather app specific? What exactly is an ELM 2140 radar system?